Surface Area of Rectangular Prisms

Bellwork: An animal shelter has 45 cats, 20 dogs, and 15 rabbits. The shelter publishes the ration of cats to dogs in its latest newsletter. What is the ratio of cats to dogs?

• 9/4

• 4/9

• 3/1

• 1/25

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

Bellwork: During a computer class, each student completed a typing exercise. Raven typed 833 words in 17 minutes. How many words per minute did Raven type?

• 66

• 49

• 20

• 48

Tags

CCSS.7.EE.B.3

Find the surface area of this image. You can work this out on page 223 of your workbook.

• 132 in²

• 176 in²

• 712 in²

• 1424 in²

Tags

CCSS.7.G.B.6

Find the surface area of this image. You can work this out on page 223 of your workbook.

• 1,499 in²

• 2,998 in²

• 4,497 in²

• 245,456 in²

Tags

CCSS.7.G.B.6

Find the surface area of this image. You can work this out on page 224 of your workbook.

• 19.36 in²

• 38.72 in²

• 77.44 in²

• 53.76 in²

Tags

CCSS.7.G.B.6

Find the surface area of the cube. You can work this problem on page 224 of your workbook.

• 75 in²

• 120 in²

• 150 in²

• 300 in²

Tags

CCSS.6.G.A.4

Page 224 #3a: All the edges of a cube have the same length. Tony claims that the formula SA = 6s², where s is the length of each side of the cube, can be used to calculate the surface area of the cube.

A. Use the dimensions from the cube above to determine if Tony's formula is correct.

• Tony's formula is correct.

• Tony's formula is not correct.

Tags

CCSS.6.G.A.4

Page 224 #3b: All the edges of a cube have the same length. Tony claims that the formula SA = 6s2, where s is the length of each side of the cube, can be used to calculate the surface area of the cube.

B. Why does this formula work for cubes?

• The formula works because all edges (dimensions) are the same and every side has the same area.

• The formula works because its shorter than the formula for the rectangular prism.

• The formula works because there are 6 sides on a prism.

Tags

CCSS.6.G.A.4

Page 224 #3c: Becca does not want to try to remember two formulas for surface area, so she is only going to remember the formula for a cube. Is this a good idea? Why or why not? Which statement below is correct?

• That is not a good idea because it is better to memorize everything!

• That is not a good idea because the formula for the surface area of a cube, 6s², requires that all dimensions are the same. In a rectangular prism the dimensions are not always the same length.

• That's a great idea. Less to remember means you will solve the problems faster.

• That's a great idea because the formula is shorter and easier to solve.

Tags

CCSS.6.G.A.4

How well do you understand surface area

• Boom! this is so easy!

• I could use a little more practice but I think I have got this.

• I need more practice and plan to watch the khan academy videos.

• Surface Area? Volume? What are you talking about?

Tags

CCSS.7.G.B.6